Stress tolerance of Antarctic macroalgae in the early life stages

BACKGROUND: Early life stages of macroalgae, especially from polar species, can be highly vulnerable to physical stressors, leading to important consequences for the fate of the whole population in scenarios of changing environmental variability. In the present study, tolerance to UV and temperature...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Navarro,Nelso P., Huovinen,Pirjo, Gomez,Ivan
Lenguaje:English
Publicado: Sociedad de Biología de Chile 2016
Materias:
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100005
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:scielo:S0716-078X2016000100005
record_format dspace
spelling oai:scielo:S0716-078X20160001000052016-09-27Stress tolerance of Antarctic macroalgae in the early life stagesNavarro,Nelso P.Huovinen,PirjoGomez,Ivan Antarctica Reproductive cells Seaweeds Temperature UV tolerance BACKGROUND: Early life stages of macroalgae, especially from polar species, can be highly vulnerable to physical stressors, leading to important consequences for the fate of the whole population in scenarios of changing environmental variability. In the present study, tolerance to UV and temperature stress, as measured by rapid adjustment of photochemistry, Fv/Fm, and photosynthetic characteristics based on P-E curves (ETRmax, &#945; and Ek), was assessed in the early life stages of six Antarctic macroalgal species from eulittoral (Pyropia endiviifolia, Iridaea cordata, Adenocystis utricularis and Monostroma hariotii) and sublittoral (Ascoseira mirabilis and Gigartina skottsbergii. RESULTS: Reproductive cells of eulittoral species showed the highest light demands (Ek &gt;45 &#956;mol photon m-2 s-1) when compared to those from sublittoral species (Ek<30 &#956;mol photon m-2 s-1). Short-term experiments of 1 h revealed that reproductive cells of P. endiviifolia, A. utricularis and M. hariotii had the highest temperature tolerance with a decrease of Fv/Fm observed only at 30 °C, while carpospores of G. skottsbergii exhibited the highest sensitivity to temperature increase with a decrease of Fv/Fm, which could be observed at 5 °C. UV tolerance was observed in reproductive cells of the eulittoral species with < 20 % inhibition in Fv/Fm from UV after four hours of exposure, while sublittoral species were more sensitive with &gt;30 % inhibition in Fv/Fm in the same condition. Enhanced temperature (7 and 12 °C) improved the tolerance of I. cordata compared to 2 °C, but exacerbated the detrimental effects of UV on A. mirabilis. CONCLUSION: Results showed that photosynthetic characteristics varied among reproductive cells of different species, reflecting the vertical zonation of parental thalli. Otherwise, these differences appear to underlie biogeographical and evolutionary components. In addition, UV tolerance was modulated by temperature increase, while temperature increase, in turn, ameliorated the detrimental effects of stress treatments in some eulittoral species (I. cordata tetraspores). In sublittoral A. mirabilis gametangia, temperature exacerbated the reduction of photosynthetic efficiency.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.89 20162016-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100005en10.1186/s40693-016-0051-0
institution Scielo Chile
collection Scielo Chile
language English
topic Antarctica
Reproductive cells
Seaweeds
Temperature
UV tolerance
spellingShingle Antarctica
Reproductive cells
Seaweeds
Temperature
UV tolerance
Navarro,Nelso P.
Huovinen,Pirjo
Gomez,Ivan
Stress tolerance of Antarctic macroalgae in the early life stages
description BACKGROUND: Early life stages of macroalgae, especially from polar species, can be highly vulnerable to physical stressors, leading to important consequences for the fate of the whole population in scenarios of changing environmental variability. In the present study, tolerance to UV and temperature stress, as measured by rapid adjustment of photochemistry, Fv/Fm, and photosynthetic characteristics based on P-E curves (ETRmax, &#945; and Ek), was assessed in the early life stages of six Antarctic macroalgal species from eulittoral (Pyropia endiviifolia, Iridaea cordata, Adenocystis utricularis and Monostroma hariotii) and sublittoral (Ascoseira mirabilis and Gigartina skottsbergii. RESULTS: Reproductive cells of eulittoral species showed the highest light demands (Ek &gt;45 &#956;mol photon m-2 s-1) when compared to those from sublittoral species (Ek<30 &#956;mol photon m-2 s-1). Short-term experiments of 1 h revealed that reproductive cells of P. endiviifolia, A. utricularis and M. hariotii had the highest temperature tolerance with a decrease of Fv/Fm observed only at 30 °C, while carpospores of G. skottsbergii exhibited the highest sensitivity to temperature increase with a decrease of Fv/Fm, which could be observed at 5 °C. UV tolerance was observed in reproductive cells of the eulittoral species with < 20 % inhibition in Fv/Fm from UV after four hours of exposure, while sublittoral species were more sensitive with &gt;30 % inhibition in Fv/Fm in the same condition. Enhanced temperature (7 and 12 °C) improved the tolerance of I. cordata compared to 2 °C, but exacerbated the detrimental effects of UV on A. mirabilis. CONCLUSION: Results showed that photosynthetic characteristics varied among reproductive cells of different species, reflecting the vertical zonation of parental thalli. Otherwise, these differences appear to underlie biogeographical and evolutionary components. In addition, UV tolerance was modulated by temperature increase, while temperature increase, in turn, ameliorated the detrimental effects of stress treatments in some eulittoral species (I. cordata tetraspores). In sublittoral A. mirabilis gametangia, temperature exacerbated the reduction of photosynthetic efficiency.
author Navarro,Nelso P.
Huovinen,Pirjo
Gomez,Ivan
author_facet Navarro,Nelso P.
Huovinen,Pirjo
Gomez,Ivan
author_sort Navarro,Nelso P.
title Stress tolerance of Antarctic macroalgae in the early life stages
title_short Stress tolerance of Antarctic macroalgae in the early life stages
title_full Stress tolerance of Antarctic macroalgae in the early life stages
title_fullStr Stress tolerance of Antarctic macroalgae in the early life stages
title_full_unstemmed Stress tolerance of Antarctic macroalgae in the early life stages
title_sort stress tolerance of antarctic macroalgae in the early life stages
publisher Sociedad de Biología de Chile
publishDate 2016
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100005
work_keys_str_mv AT navarronelsop stresstoleranceofantarcticmacroalgaeintheearlylifestages
AT huovinenpirjo stresstoleranceofantarcticmacroalgaeintheearlylifestages
AT gomezivan stresstoleranceofantarcticmacroalgaeintheearlylifestages
_version_ 1718439701742878720